Vibratory telegraphy.



No. 734,689. PATENTBD JULY 28, 1903.

S. D. FIELD.

VIBRATORY TELEGRAPHY.

APPLICATION rum) D110. 18, 1902.

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Patented July 28, 1903.

FFICE.

ATENT STEPHEN DUDLEY FIELD, OF STOCKBRIDGE, MASSACHUSETTS.

VIBRATORY TELEG RAPHY.

SPECIFICATION forming part Of Letters Patent No. 734,689, dated July 28,1903. Applicationfiled December 18, 1902. Serial No. 135,689. (llomodel.)

loosely-pivoted lever, the free end of which by colliding with acontact-point on said vibrating medium serves to close the circuit of alocal battery and sounder or other receiving apparatus. Under certainconditions such an organization of apparatus is operative; but undervery delicate adjustment the contacts have a tendency to weld, whilewith vibrations of extreme slowness-sa'y sixteen complete waves persecondgreat difficulty is experienced in making an adjustment which willopen during the reception of 'vibra-' tions and at the same time bequick enough in action to close promptly upon their cessation. 4

In the present invention I show an assemblage of parts consisting of twolevers reacting on each other in such manner that each movement of thevibratory medium either backward or forwardis accompanied by a break inthe local circuit, the break in one direction beingcontinued until thatin the other is established, with the result that the local circuit isheld continuously open during the receipt of the vibratory currents. Ialso provide means whereby latitude of movement is allowed thevibratory'element to compensate for slight movements caused by vagrantor other non operative currents. The apparatus is adapted to any form ofvibrating medium, whether tuned to harmonic vibrations or neutral, andas such responsive to any sequence of pulsations.

In the drawings, Figure 1 represents the invention somewhatconventionally, and Fig. 2 a detail thereof.

R is a vibrating reed, serving as an exam-- of periodicity and actuatedby the electrorying the contacts.

justable in distance from thefulcrums.

magnetic coils N S when traversed by currents of the proper sequence.

2 and 3 are contacts mounted on opposite sides of the reed andelectrically connected through the body of the reed ,or otherwise.

a and Z) are two levers embracing between their free ends that portionof the reed car- Said levers have corre: s'ponding contacts, 1 beingopposite 2 and 4 opposite 3. Lever a is pivoted about midway of itsextremities at a, while lever b is considerably longer than a and ispivoted at one end, being connected nearits middle point with theextremity of a through a link a. In consequence of this interconnectiona movementof the free end of one lever is accompanied by a motion in anopposite direction of the other. The free ends of the levers arenormally drawn toward each other by a light insulated spring 01. For thepurpose of obtaining a pendulum action of the levers weights 6 areplaced. thereonand made ad- In practice the adjustment should be suchthat the rate of swing of the lever system is a little slower than thenormal rate of vibration of the reed. The joint between link and one ofthe levers provides for slight independent movement of the levers and isshown :fully in Fig. 2, wherein the connecting-pin. f is conical andadjustable lengthwise through a large holef in the link. The adjustmentof the pin determines the freedom of movement and permits the levers torattle without communicating motion from one lever to the other. Thelocal circuit contains the batte'ry g and the receiving device 11 ofsuitable character and is normally closed through Wire 5, lever a,contacts 4 3, the reed, contacts 2 1, lever b, and wire 6, link 0 beingof insulating material.

The operation is as follows: Normally both pairs of contacts are heldtogether by spring Upon receipt of operative vibratory currents whichtraverse the coils thereed-f'vibrates. On the movement to the right,contacts 3 and tbeing together, lever awill transfer reverse motion tolever 12 via link 0, and contacts 1 2 will open the local circuit. Whenthe reed has completed its excursion to the right and commenced itsreturn movement, the momentum acquired by weights e will continue themovement of the levers, and contacts 3 4 will separate, thus break- .ingthe local circuit in another place and preventing its reestablishmentwhen contacts 1 2 collide. When the reed strikes 1), 3 4 are continuedapart and so remain until the return of the reed, when they collidewhile 1 2 are yet open. Thus as long as the vibrations continue thelocal circuit remains open; but when they cease the spring d immediatelycloses all contacts and completes the circuits. The receiving device 11indicates or records the periods during which vibrations occur.

It will be obvious from the foregoing description that stray or vagrantcurrents, which are usually manifested in weak vibrations,will not belikely to open the local circuit, since the lost motion provided in thejoint ff will enable the spring to keep the contacts against the reed.It will also be obvious that while the description of my invention hasdealt With a normally closed local circuit the apparatus is readilyadapted to control a normally open circuit, in which case the vibrationsof the reed would serve to close the circuit during their occurrence.

Having described my invention, I claim 1. The combination of a vibratoryelement, an electric circuit, and a circuit-controller actuated by saidvibratory element and adapted-to alter the normal condition of saidcircuit with respect to continuity and maintain such alteration duringthe vibration of the vibratory element.

2. In a signaling system, a receiving apparatus consisting of thecombination of a vibratory element, a local circuit containing suitablereceiving devices and a circuit-controller actuated by said vibratoryelement and adapted to alter the normal condition of said circuit withrespect to continuity and maintain such alteration during the vibrationof the vibratory element.

3. The combination of a vibratory element, an electric circuitcontrolled thereby and ineluding in series a plurality of pairs ofseparable terminalsand means actuated by the vibratory element foralways having at least one pair of said terminals in series separatedduring the vibration of the vibratory element, substantially asdescribed.

4. In vibratory telegraphy,the combination of a vibratory element, anelectric circuit and a plurality of interconnected levers movedsuccessively by the vibratory element and each adapted to open thecircuit when moved by the other.

5. In vibratory telegraph y,the combination of a vibratory element, anelectric circuit and a plurality of interconnected levers movedsuccessively by the vibratory element and each adapted to open thecircuit when moved by the other, and means whereby the lovers Will tendto continue their motion after being started.

6. In vibratory telegraphy,the combination of a vibratory element, twolevers making independent contact with opposite sides of said elementand a local circuit including a receiv ing device, levers and vibratoryelement, said levers being so interconnected that their motions are inopposite directions.

7. In vibratory telegraphy,the combination of a vibratory element, twolevers making independent contact with opposite sides of said element, alocal circuit including a receiving device, levers and vibratoryelement, said levers being so interconnected that their motions are inopposite directions and means forimpartingapendulum-motionto thelevers.

8. In vibratory telegraphy,the combination of a vibratory element, anelectric circuit and a plurality of interconnected levers movedsuccessively by the-vibratory element, and each adapted to open thecircuit when moved by the other and means whereby said levers will havelimited motion independent of each other.

In witness whereof I subscribe my signature in presence of twowitnesses.

STEPHEN DUDLEY FIELD.

Witnesses:

F. F. CORLISS, CHAS. E. HULL.

